FOSI Audio GR70 36 W AV Control Amplifier  (Black)

Fosi Audio GR70 Tube Headphone Amp Preamp, Authentic Tube-Amplification with Vacuum 5654W*2 & 6AC7*2, Mini HiFi Preamplifier for Home Audio, 3.5mm & 6.35mm Jacks Supporting 16-300 ohms Impedance. About this item Pure Tube-Amplification: The GR70 headphone tube amp combines vintage charm with modern tech, delivering authentic tube essence. Perfect for headphone enthusiasts, it pairs excellently with over-ear and in-ear headphones for superior audio Quad Tubes: Features two 5654W and two 6AC7 vacuum tubes for two-stage amplification. The 5654W tubes boost voltage, while the 6AC7 tubes handle power amplification. This setup delivers balanced, transparent, and textured sound User-Friendly Design: This tube headphone amp preamplifier offers intuitive controls, including a large volume knob, dual-side ventilation holes, bass & treble controls, high and low impedance mode switching, making it versatile enough Two-in-One: It supports low and high impedance modes switching to adapt 16Ω-300Ω headphones, and features 6.35mm/3.5mm headphone jacks on the front and RCA Input/Output on the rear for home audio HiFi system integration Compact Yet Powerful: Crafted with a CNC-machined aluminum alloy body, the GR70 is both durable and refined. Despite its compact size, it delivers up to 300mW power output and 1.2V RCA output with SNR ≥97dB—offering warm, clean, and dynamic sound Integrating Vintage Charm with Modern Precision The GR70 is a two-in-one headphone amp and preamp. Easily integrate this tube preamp into your home audio system with its multiple headphone jacks and RCA input/output options. Input: RCA; Output: RCA, 6.35mm/3.5mm Headphone Output; Max Power Output: 300mW@32Ω;Rated Power Output: 90mW@32Ω;Power Input: DC 12V/3A; Headphone Impedance: Low Mode: 16Ω-120Ω, High Mode: 120Ω-300Ω; SNR≥97dB; Frequency Range: 20Hz - 20kHz (±1 dB); What's in the box Fosi Audio GR70 Main Unit 6AC7 Vacuum Tubes 5654 Vacuum Tubes Tube Protection Covers 12V/3A Power Supply